Ok I know everyones tired of hearing about these. Sorry. I've got a 90 325i. Just dropped in for an m50 out of a 92 325. Got everything hooked up. No start. When pulled off the fuel lines and turned the block over no fuel. Pump doesn't register. I pulled off the the crank sensor. Its still good. Dme and fp relay is working correctly. When I try and jump terminals at the fp relay still no fuel. The fuel pump worked 3 days ago with the m20 in it. No blown fuses. Im just confused at this point.

Funny you should mention that. I checked the continuity of the 2 black wires on the passenger of the m50 harness. Well long story short the big one is a ground and the smaller one Is constant power on the power post. Friggin fired up after 3 turns